I have a 350 chevy engine (ZZ4) with a TH350 Trans and a TCI Saturday Night Special torque converter. The Trans has a B&M shift kit.

My problem is that I have 3:08 9" ford rearend in a 3200 pound car and according to all the calculators I should run 2455 RPM at 65 MPH. I pulled the rear out this weekend and counted teeth on the pinion and the ring gear. (13 Pinion and 39 Ring).

The car runs great, shifts good but the performance isn't as good as I think it should be.

I currently run ~3200 RPM @ 65 MPH, 2000 RPM @ 40 MPH etc. Could this be a problem with the torque converter slipping to much?

I am considering switching to a stock coverter but I am unsure what the problem is.

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